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isobar

Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A line on a weather map connecting points of equal atmospheric pressure.
  • noun Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.

from The Century Dictionary.

  • noun In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system when p has any constant value; a line of equal pressures.
  • noun In physical geography, a line connecting places on the surface of the globe at which the barometric pressure is the same.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Phys. Geog.) A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun meteorology A line drawn on a map or chart connecting places of equal or constant pressure.
  • noun nuclear physics Either of two nuclides of different elements having the same mass number.
  • noun thermodynamics A set of points or conditions at constant pressure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (meteorology)an isogram connecting points having equal barometric pressure at a given time

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[iso– + Greek baros, weight; see gwerə- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἴσος (isos, "equal") + βάρος (baros, "weight")

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Examples

  • I call it “isotropic platting” after the “isobar”.

    Province pushes Evergreen Line ‘aggressively’ « Stephen Rees's blog 2010

  • I took a quick glance at the barograph, and at the isobar chart of the day before.

    Movie Night 2010

  • The marine component includes the open sea between these islands up to limit of the isobar of 40 m depth.

    Salinas de Ibiza y Formentera Nature Reserve, Spain 2008

  • And worse, a 48-hour prediction put the tight hoops of isobar lines that signaled the storm right in the path of the fleet.

    CNN Transcript Jan 1, 2002 2002

  • If a line were drawn through all points on the surface of the earth having an equal barometric pressure at the same time, such a line would be called an isobar.

    General Science Bertha M. Clark

  • The weather has been variable, with cryptoconchoidal deflections of a solid reverberating isobar previously tested in a solution of zinc and soda-water.

    Punch, or the London Charivari, Volume 99, July 19, 1890 Various

  • Now, if you look at the map, Mr. Tighe, you'll see that the isobar for this region shows a barometer pressure of 29.50, a terrific drop of four points in twenty-four hours.

    The Boy with the U. S. Weather Men Francis Rolt-Wheeler 1918

  • Now, Mr. Tighe, you can see from the map that the barometric pressure, the isobar, running through this part of the country shows a barometric pressure of 30.30.

    The Boy with the U. S. Weather Men Francis Rolt-Wheeler 1918

  • Jeff squints, takes a deep breath, and stares deeply into the late afternoon sky, turning his head - perhaps mentally overlaying computer-generated graphics onto the swirling clouds, time-lapse isobar gradients and Doppler bands to help form his decision.

    The Aristocrats Paul Hinrichs 2010

  • For more information about Isobar North America, please visit www. isobar.com.

    The Earth Times Online Newspaper 2010

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